问题
qemu模拟的是arm64的debian系统，在apt update的时候，总会报错，导致我想下个tcpdump也没有找到包
Get:1 http://mirrors.ustc.edu.cn/debian unstable InRelease [195 kB]
Err:1 http://mirrors.ustc.edu.cn/debian unstable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
Reading package lists... Done
W: GPG error: http://mirrors.ustc.edu.cn/debian unstable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
E: The repository 'http://mirrors.ustc.edu.cn/debian unstable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
debian的版本
我的qemu中的/etc/apt/sources.list文件内容如下
deb http://mirrors.ustc.edu.cn/debian/ unstable main non-free contrib
deb-src http://mirrors.ustc.edu.cn/debian/ unstable main non-free contrib
解决方法
前面的报错提示信息中有两个key，分别是6ED0E7B82643E131跟0E98404D386FA1D9
输入这两条命令，然后重新update即可
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9
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